US2468300A - Automatic telephone system - Google Patents

Description

M. E. MALONEY ET AL AUTOMATIC TELEPHONE SYSTEM pril 26, 1949.

Filed Aug. 14, 1945 6 Sheeizs--Sheei'l 1 subs Dk #W5/vrom M E- MALONEV F. F. -sH/PLEV BV April 26, 1949- M. E. MAL.'0|\1EY ET AL 2,468,300

AUTOMATIC TELEPHONE SYSTEM Filed Aug. 14, 1945 y 6 SheelZS-Sheel'l 2 2H v nea/:Tens sequence u nl n "Ii-'k' III INCOMING PULSE RECEIVING CIRCUIT /200 F/G. Z

A rice/ver April 26, 1949.v M.' E. MALONEY ET AL 2,468,300.

' v AUTOMATIC TELEPHONE SYSTEM Filed Aug. 14, 1945 e sheets-sheet 5 SEQUENCE RELYS l I l I III; Il@

Ol/TGOING PULSING CIRCUI T ATTORNEY.

` April 26, 1949.v M. E( MALNEY ET,A| 2,468,300

` AUTOMATIC TELEPHONE SYSTEM Filed Aug. 14,. 1945 6 Sheets-Sheet 4 REG/STER .FENDER /7 MARKER u n cuss Mur: CONNECTOR /6 kzzs- L MeMALo/VEV /NVEVTORSE-F. SHI/LEV By WW- ATTORNEY AApril v26, 1949.v M. E. MALONEY ETAL 2,468,300

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-. uw; #una keur neu r nu y F G. 5 l Y M. E MALONE Y ATTORNEY April 26, 1949.v M E, MALQNEY ET AL 2,468,300

` A AUTOMATIC TELPHONE SYSTEM Filed Aug. 14,* 1945 6 Sheets-Sheet 6 TOLL COMPLET/NG MAR/(ER Z0 REA TRANSLATOR l COMMON TRANJLATR! I 32 i J3 I E. MALO/v5? WENO/S F. F. sH/PLEV ATTORNEY Patented pr. 26, 1.949

AUTOMATIC TELEPHONE SYSTEM Martin E. Maloney, Flushing, N. Y., and Frank F. Shipley, TenaIY, N. J., assignors to Bell Telephone Laboratories, incorporated, New York, N. Y., a corporation of New York Application August 14, 1945, Serial No. 610,724

14 Claims.

This invention relates to telephone systems and particularly to toll systems employing automatic switches for completing connections between calling and called subscribers and operators.

Objects of the invention are an increased eiliciency in the automatic routing of toll calls, the minimization of the time required for completing such calls, and generally the improvement of the control of automatic switching in toll telephone systems.

In extending the use of automatic switching equipment in toll telephone systems and in enlarging the area within which toll calls may be completed without the aid of an operator and also in reducing to a minimum the number of operators involved in the completion of built-up connections through a plurality of toll offices in tandem, the register-senders used in routing a call must be capable of registering both the toll and local oflce code digits. The routing of a through call at a particular toll olilce depends on only the toll code, the routing of a terminating call depends only on the local oce code, and the routing of calls to oflices in toll areas in which there is more than one inward toll center may depend on both the toll and local oilice codes. Ii a marker were called in only after the number of digits registered equal the maximum number representing both cnice codes, toll and local, the extension of calls which are routed responsive to the toll code alone would be unnecessarily delayed while the local oice code was being registered or until time enough had elapsed to determine whether any further digits would be registered. To seize a marker twice, once at the end of the toll code and again when the local code is registered if the routing depends on both codes, is also objectionable.

This invention is a telephone system comprising register-sender and marker controlled switches in which a pretranslator is called in by a register-sender after sumcient digits have been registered therein to represent a toll route code.

A feature of the invention is a telephone system comprising register-sender and marker controlled switches in which the register-sender used on an incoming toll call is connected to a pre-translator as soon as enough digits have been registered to represent either a toll or a local ofiice code and in which the pretranslator receives these digits from the register-sender and then tells the register-sender what kind of a marker to use, when to call in the marker, and what information must be transmitted to the marker. If a call is one which is to be routed directly to the called local cnice, the pretranslator tells the registersender to immediately call in a toll completing marker and to transmit to the marker the same digits which are transmitted to the pretranslator. l'f a call is one for which the terminating toll office is in the same numbering area as that inr which the register-sender is located, the pretranslator tells the register-sender to immediately call in an intertoll marker and to transmit to the marker the same digits which were transmitted to the pretranslator. 1f a call is one for which the terminating toll oihce is in a toll area which is accessible through two or more direct trunk groups, thepretranslator tells the.

direct group of ring-down or dial trunks is provided, the pretranslator tells the register-sender to immediately call in a toll marker, transmit to the marker the same digits which were transmitted to the pretranslator and tell the marker to use the translator which is common to a plurality of areas. If a call is one for which the terminating toll cnice is in an area to which there is no direct group of trunks, the pretranslator tells the register-sender to immediately call in a toll marker, transmit to the marker the same digits which were transmitted to the pretranslator and tell the marker to use the translator common to a plurality of areas; and the pretranslator further tells the register-sender to transmit over the selected trunk all of the digits registered in the register-sender.

A clear and complete description of these and other features of the invention will be facilitated by considering a system in which the invention is embodied, one such system being represented schematically in the drawings which constitute a part of this specification. The invention is, however, not limited in its application to the system and arrangements shown in the drawing but is generally applicable to automatic` switching and control systems. Referring to the drawing,

toll oices A and B;

Figs. 2, 3 and 4 represent a register-sender Il in oice B;

Fig. 5 represents a pre-translator I9 in office B; and

Fig. 6 represents marker equipment in omce B.

The system represented schematically in Fig. 1 comprises switches of the cross bar type and is generally similar to that disclosed in the patent to G. V. King, J. B. McKim and O. Myers, No.

2,236,246, granted March 25, 1941. The toll ofc A comprises an operator position I2 which includes an operators telephone and key-set, a cord II, jacks Ill and I3, and an outgoing trunk circuit I4. Jack Il] may terminate a toll recording completing trunk from a local ofilce and we may assume that one end of cord II has been connected with jack I@ to answer a call initiated at a local subscribers station. The cord, position and key-set equipment, and the outgoing trunk circuit I4, may be similar to like equipment and trunk circuits disclosed in the patent to P. B. Murphy, No. 2,288,251, granted June 30, 1942, and the patent to G. Hecht, A. A. Lundstrom and E. R. Taylor, No. 2,332,912, granted October 26, 1943. The incoming trunk circuit I6 and register-sender II may be similar to the incoming trunk circuit shown in Fig. 6 and registersender shown in Figs. 23 to 35 of Patent No. 2,382,- 893, granted Aug. 14, 1945 to B. McKim and O. Myers, except that the register-sender is modied to incorporate therein features of the present invention. The marker-connector i8 is similar to the marker-connectors disclosed in the aforementioned patent to King, McKim and Myers and in the aforementioned patent to McKim and Myers except that it is arranged to provide for the connection of the register-sender to a pretranslator in addition to providing for the connection of the register-sender to a toll completing marker r afn intertoll marker. The toll completing marker 2'0 is similar to the marker disclosed in the aforementioned King-McKim-Myers patent and so also is the intertoll marker 30 except that it includes a plurality of translators, area translators 3`I and 32 being individual to the marker 3l) and translator 33 being common to all intertoll markers in oce B. An area translator is provided for an area to Which there is a large volume of traiic and a lplurality of direct trunk groups from office B. A translator common to all intertoll markers may be provided for all areas to which there is a single group of trunks. The aforementioned McKim-Myers patent discloses both toll completing and intertoll trains of switches for connecting incoming trunks with outgoing trunks to local and toll ofces and discloses a marker which may be either a toll completing marker, an intertoll marker, or a combined toll completing and intertoll marker. Reference may also be had to the patent to Strickler No. 2,283,395, granted May 19, 1942, for disclosure of a register-sender arranged to give to the marker the particular code digits which determine the routing of the call and tell the marker which of a plurality of translators is to be used in connecting the calling incoming trunks to an idle outgoing trunk in a desired trunk group.

Assume now that a toll call has been initiated over intertoll trunk I by the interconnection of cord Il and outgoing trunk circuit I4 and that the associated incoming trunk circuit I6 has been connected to the register-sender Il. When the key-set at position I2 is operated to transmit the required code and numerical digits for completing the call, the digit signals thus transmitted are received by the incoming pulse receiving circuit 293 oi register-sender Il and are successively registered under the control of sequence relays Etl to EIEl, inclusive, in the registers 2H to i225, inclusive, one digit on each register beginning With register 2li in the manner disclosed in detail in the aforementioned Hecht-Lundstrom- Taylor patent. As soon as three digits have been registered, ground is connected to conductor 223 to eiect the operation of relay 40G and thereby cause the release of relay 401, relay 40| having been operated at the time of the connection of register-sender I'l to trunk circuit IS. The release of relay dill causes the operation of relay 452, whereby battery is connected to conductor 453 to effect the operation of the sender preference relay 439 and sender connector relay 4H) in an idle marker-connector as described in detail in the aforementioned King-McKim-Myers patent. IThe operation of relay 4I@ closes a circuit for operating the auxiliary sender connector relay 355 and closes a circuit for operating a translator preference relay 425 associated With an idle pretranslator I9, this circuit being traced from battery through a front contact of relay 432, conductor 493, a back contact of relay 495, contact M4 of relay dit and winding of relay 425 to ground. rlhe broken line connections to the winding of relay 425 represent other relay contacts similar to those shown in detail in the operating circuit of a marker preference relay in the aforementioned King-McKim-Myers patent. The operation of relay 425 causes the operation of relay 435 whereby the register-sender I'I is connected through contacts of relays 4m and 43D to the pretranslator I5. Each of the contacts llII, 4I2 and M3 of relay 4&3 and contacts 43|, 432 and 433 of relay 433 represents a set vof four contacts through which the registers of the sender are connected to the registers of the pretranslator. |lhus the A, B and C registers of the pretranslator I9 are set to correspond to the setting of registers 2H, M2 and 2I3 of the registersender. Relay liti represents one of the translator hundreds relays and relay 552 represents one of the translator tens relays, the translator being similar to the translator of a toll completing or intertoll marker as disclosed in detail in the aforementioned King-McKiin-Myers patent. Seven route relays 533 to 539, inclusive, are shown. The route relay 553 corresponds to route code 243 and the other route relays may correspond to codes such as 425, 353, 762, 5I5, Slt and 4M, respectively. The operating circuit of the route relay 593 for route 243 is shown and a similar operating circuit is closed for each of the other route relays when the corresponding route code is registered.

While the route relays of the pretranslator `I9 are operated in similar manner to that in which the route relays :of a marker are operated, the operation of a route relay of the pretranslator is not eiective to control the operation of cross bar switches but merely serves to give the register sender information as to the class of the call. Code terminals, one for route are provided for cross-connection to class terminals, one for each different class of call. Route relays 5113 and 505, corresponding to codes 243 and 353, represent local ofiiccs to which calls are routed directly from toll oiice B; and both of the associated code terminals 523 and 525 are cross-connected to class terminal 535. Route relaysl'and't, corresponding to codes 436 and '152, represent local oces which are reached through the saine toll office to Which there is a direct group of trunks from oflice B; and both of the associated code terminals 524 and 525 are cross-connected to class terminal 536. Route relay 501, corresponding to code I5, represents a toll area to which there are a plurality of direct trunk groups, the trunks in,

each group terminating in a different toll office; and the associated code terminal 52? is cross-con nected to class terminal 531. Route 508, corresponding to code 3|6, represents an area which is reached over a single direct group of trunks; and the associated code terminal 528 is cross-connected to class terminal 538. Route relay 509, corresponding to code 4|4, represents an area to which there is no direct group of trunks; calls to this area are routed through a group of direct trunks to an intermediate toll oiiice and the assou ciated code terminal 529 is cross-connected to class terminal 539.

Assume iirst that the code, registered on the rst three registers of the register sender and transferred to the A, B and C registers of the pretranslator, is the code 243. With the hundreds relay 50| operated under the control of the A register, and the tens relay 592 operated under control of the B register, a circuit is closed from ground in the C register for operating route relay 503. The operation of relay 503 connects ground to code terminal 523, thence through class terminal 535, contact 435 of relay 430 and contact 4|5 of relay 4l@ to effect the operation of class relay 450 in the register sender. Relay 453- locks and closes circuits for operating relays 499, 455 and 340. Relay 499 locks, opens the circuit energizing the winding of translator preference relay 425 and closes a circuit for energizing the Winding of marker preference relay 369. The release of relay 425 causes the release of relay 430 thereby disconnecting the register sender from the pretranslator. The circuit for operating marker preference relay 369 is traced from battery through the front contact of relay 402, a front contact of relay 499, a front contact of relay 455, contact 368 of relay 360 and the Winding of relay 359 to ground. The operation of relay 359 closes a circuit for operating relay 303 whereby the control conductors from the A, B and C registers 2I I, 2|2 and 2I3 of the register sender are connected through contacts 34|, 342 and 343 of relay 340, contacts 36|, 362 and 353 of relay 360, and contacts 38|, 382 and 383 of relay 385 to the A, B and C registers oi the toll completing marker 20. Each of the contacts 34|, 342 and 343 of relay 340, each of the contacts 35|, 352 and 353 of relay 360 and each of the contacts 33|, 392 and 383 of relay 330 represent a set of four contacts through which the A, B and C` registers of the register sender are connected to the A, B and C registers of the marker. Thus the registers of the marker 20 are set to register the same digits which were transmitted to the pretranslator. The marker 20 thereupon controls the selection of a trunk in a group of trunks leading directly to the called local office and the establishment of the connection through the toll completing train of switches between the incoming trunk circuit I6 and the selected outgoing trunk circuit. On such a call the register sender transmits over the outgoing trunk the succeeding digits registered in the register sender, which digits are numerical digits of the called subscribers number. These digits are transmitted by the outgoing pulsing circuit 300 under the control of the sequence relays .beginning with relays 3I4 and 324 in the manner described in detail in the aforementioned McKim-Myers patent. The circuit for operating relays 3 I4 and 324 is traced from battery through the windings of these relays in series, through a back contact of relay 325, conductor 49|, back contact of class relay 490, to ground at a back contact of relay 450.

Consider next a call on which the code registereol on the A, B and C registers of the register sender il and transferred to the registers of the pretranslator I9 is a code which effects the operation of the route relay 505. The operation of relay 593 connects ground to code terminal 52S, thence through class terminal 535, Contact 435 of relay 435 and contact 4I5 of relay 4&3 to operatively energize the winding of class relay 450 in the register sender. Relay 450 locks and closes circuits Afor operating relays 499, 455 and 340. Relay 499 locks, opens the circuit energizing the winding of translator preference relay 425 and closes a circuit for energizing the winding of marker preference relay 355, The release of recauses the release of relay 430 so as to disconnect the register sender from the pre- Jtranslator. The circuit for operating marker preference relay 355 is traced from battery through the front contact of relay 402, a front contact of relay 493, a back contact of relay 4'55, a iront contact of relay 455, contact 354 of relay and the winding of relay 355 to ground. The operation of relay 335 closes a circuit for operating relay 373 whereby the control conductors from the A, B and C registers 2li, 2|2 and 2|3 of the register sender are connected through contacts 534i, 342 and 343 of relay 349, contacts 35|, 352 and 353 of relay 360 and contacts 35|, 372 and 343 of relay 373 to the A, B and C registers or an intertoll marker 30. Each of contacts 33|, 332 and 343 represents a set of four contacts through which the registers of the inter-toll marker are connected to the registers 0i the register sender. Thus the same digits that were registered in the pretranslator are registered in the intertoll marker; and, with both of relays and @I9 normal, the common translator 53 is used to effect the operation oi a route relay and thereby select an outgoing trunk in a group leading directly to the terminating toll oiiice which is in the same toll area as is office B. The operated route relay elifects the connection of the incoming trunk circuit I5 through the intertoll train of switches to the selected outgoing trunk circuit. On such a call there are only seven digits registered in the register sender, these digits being the local oflice code and numerical digits of the called subscribers number. rIhese digits are transmitted under the-control of the seeuence relays beginning with relays 3l I and 32| as above described. With relay 450 operated, ground is connected to conductor 492 to operate sequence relays 3|! and 32| instead of relays 3M and 324 as above described; wherebyv the transmission of digit impulses starts with the digit registered on the A register and all seven digits are transmitted over the selected outgoing trunk.

Assume next a call on which the code registered on the A, B and C registers of the register sender il and transferred to the registers of the pretranslator I9 effects the operation of the route relay Relay 552i connects ground to code terminal 527i, thence through class terminal 531, Contact 43'! of relay 430 and contact 4l? oi relay 'SI5 to operatively energize the winding of class relay 479 in the register sender. Relay MI5 locks and closes a circuit for operating relays 499 and 'antrace 350'. vRelay 499 locks and opens the circuit for energizing the winding of marker preference relay 425; and therelease oi relay 425 causes the release oi relay 430, whereby the pretranslator |9 is disconnected from the register sender l1. The register sender i1 is not connected to a marker after the pretranslator is released until an additional three digits have been registered in the register sender, these three digits being the local olice code digits which are to be trans- Initted to the marker ior use in selecting the trunk group through which the call is to be completed. When the F register 2|5 has been set and class relay 410 is operated, a circuit is closed from ground through the lowest iront contact of relay 41D, conductor 412, a front contact of one or more of the register relays of the register 2 l5, conductor 226 and winding of relay 4'65. Relay 465 is thus operated after the local oii'lce code digits have been registered and closes the circuit for operating the marker preference relay 365 as above described to effect the operation ci relay 310. With relays 355 and 315 operated, the D, E and F registers ci the register sender are connected through contacts 35|, 352 and 353 of relay 359, contacts 36|, 362 and 363 of relay 359 and contacts 31|, 312 and 313 oi relay 315, to the A, B and C registers of the intertoll marker so that the registers of the marker are set in accordance with the local oflice code digits regisn t'ered in the register sender. The operation of relay 319 also closes a circuit for operating relay 6|() in the marker 39, the circuit for operating relay SIU being traced through contact 251i of relay 310, contact 351 of relay 359, conductor M3 and a iront contact of class relay 413. The operation of relay 6|!) connects the A, B and C registers of marker 39 to the area translator 3|, this translator being used for all calls outgoing to a particular toll area into which there are a plurality of direct groups of trunks, the particular group of trunks over which a call is to be routed depending on the local ofce code. Relay BEI] is similarly operated in case the class relay operated by the pretranslator is one which indicates that the area translator 32 is to be used on a call. A route relay is operated which eects the -connection of the incoming trunk circuit i through the intertoll train of switches to an cutgoing trunk circuit in a group which leads to a toll oflice in the called toll area through which toll oce the called local oiiice is accessible over a direct group of trunks. On such a call the local office code and numerical digits registered in the register sender are transmitted over the selected outgoing trunk under the control of the sequence relays beginning with relays 3 i and 325i.

Assume now a call on which the code registered on the A, B and C registers of the register sender l1 and transferred to the registers of the pretranslator i9 eiects the operation of route relay 568. Relay 508 connects ground to code terminal 428 thence through class terminal 538, contact 438 of relay 430 and contact 4| of relay 4H) to operatively energize the winding of class relay 480 in the register sender. Relay 489 locks and closes circuits for operating relays 499, 495 and 340 whereby the A, B and C registers of the register sender are connected to the registers of an intertoll marker 35 in the manner hereinbefore described. The registers of marker Sil are connected to the common translator 33, whereby a rout-e relay is operated to effect the selection of a trunk in a group leading directly to the called toll office. If the trunk is a ring-down trunk,

the operated route relay does not cause the trans"-l mission of any of the digits registered in the register sender. But if the trunk is a dial trunk, the operated route relay causes the transmission oi the local oiiice code and numerical digits registered in the register sender under the control of the sequence relays beginning with relays 314 and 324 as hereinbefore described.

Assume now that the call is one on which the code registered on the A, B and C registers of the register sender |1 and transferred to the registers of the pretranslator I9 effects the operation of route relay 559. Relay 509 connects ground to code terminal 529, thence through class terminal 539 to operate relay 540. Relay 545 closes circuits through contacts 438 and 439 of relay 43B and contacts 4|8 and 4|9 of relay M5 for operating class relays 480 and 49D. The operation of relay 480 causes the operation of relays 499, 465 and 34|] whereby the A, B and C registers of the register sender are connected to the registers of an intertoll marker 39 and the marker registers are connected to the common translator 33 as hereinbefore described. The

operation of the route relay corresponding to the toll code digits eiects the selection of a trunk in a group of trunks outgoing to another toll oince through which the called toll oiiice is accessible, and it is necessary to send to the intermediate toll oilce not only the local oflice code and numerical digits but also to send the toll code digits to enable the further routing of the call. To this end, the class relay 490 disconnects ground from conductor 49| to prevent the immediate operation of the sequence relays 3|4 and 324 and connects ground to conductor 492 to` cause the operation of sequence relays 3|| and 32|, so that the sending of digits by the outgoing pulsing circuit 349 will start with the digit registered on the A register of the register sender,

the succeeding digits rlegistered being trans-` mitted one after the other under the control of the succeeding sequence relays. Y

It is to be noted that whereas on a call on which route relay 551 of the pretranslator I9 is operated, the class relay 419 eiects the transmission of only the local office code digits to the intertoll marker, the arrangement might be modiiied to have the toll code digits transmitted to the intertoll marker to effect selection of the translator and th'en the transmission of the local office code digits to the marker to effect the selection of a trunk and extension of the connection thereto. This and other modifications may be made within the scope of the invention as defined by the claims.

What is claimed is:

1. In a toll ofce of a switching system comprising a plurality of toll and local onices, incoming trunks, outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a register-sender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits,

translating means effective to translate a pre-` prising a plurality of tool and local oices, incoming trunks, outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a register-sender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits, translating means eective to translate a precien ter-mined number of digits each of any value as soon as registered in said register-sender, markers each including individual translating means for controlling the operation of said switching means to connect a calling incoming trunk to an idle outgoing trunk, means controlled by said iirstmentioned translating means for immediately effecting the association of a marker with said register-sender and the transmission` of the saine digits to said marker as were transmitted to said rst-mentioned translating means.

3. In a toll ofce of a switching system comprising a plurality of toll and local oices, incoming trunks, outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a register-sender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits, translating means effective to translate a pre determined number of digits each of any value as soon as registered in said register-sender, toll completing markers, intertoll markers, each of said markers including individual translating means for controlling the operation of said switchimT means to connect a calling incoming trunk to an idle outgoing trunk, and means controlled by said firstanentioned translating means for immediately eiecting the selective association of a toll completing marker or an intertoll marker with said register-sender.

4.a. In a toll office of a switching system cornprising a plurality of toll and local oces, incoming trunks, outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a, register-sender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits, translating means eiiective to translate a predetermined numher of digits each of any value as soon as registered in said register-sender, markers each including individual translating means for controlling the operation of said switching to connect 9, calling incoming trunk to an 'die outgoing trunk, and means controlled hy inst-mentioned translating means for effecting the association of a marker with said register-sender as soon as an additional predetermined number of digits are registered in said register-sender.

5. In a toil ofiice of a switching system compricing a plurality of toll and local ofces, incoming trunk.: outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a register-sender connected .to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits, translating means effective to translate a prec'letermined nur her of digits each ci any value as soon as registered in said register-sender, markers each including individual translating m ans for controlling .the operation of said switching means to connect a calling incoming trunk to an idle outgoing trunk, and means controlled by nrst-mentioned translating means lor effecting the association of a marker with said register-sender as soon as an` additional predetermined number of digits 'are registered 10 in said register-sender and for transmitting to said marker said additional digits registered in said register-sender.

6. In a toll oice of a switching system comprising a plurality of toll and local offices, incoming trunks, outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a register-sender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits, translating means elTective to translate a predetermined number of digits each of any Value as soon as registered in said register-sender, markers for controlling the operation of said switching means to connect a calling incoming trunk to an idle outgoing trunk, each of said markers including a plurality of different translators, means in said register-sender controlled by said Erst-mentioned translating means for effecting the association of an idle one of said markers with said register-sender and for effecting the selection of a desired one of said translators in the associated marker.

7. In a toll cnice oi a switching system comprising a plurality of `toll and local offices, incoming trunks, outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a registersender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits, .translating means effective to translate a predetermined number of digits each of any Value as soon as registered in said register-sender, markers for controlling the operation of said svn'itching means to connect a calling incoming trunk to an idle outgoing trunk, each of said markers including a plurality of different translators, means in said register-sender controlled by said first-mentioned translating means for efrect-ing the association of an idle one of said markers with said register-sender as soon as an additional predetermined number of digits are registered in said register-sender, for eiecting the selection of a desired one of said translators in the associated marker, and for transmitting to said associated marker said additional digits registered in said register-sender.

8. In a toll office of a switching system comprising a plurality of toll and local offices, incoming trunks, outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a register-sender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits and comprising means for transmitting over a selected outgoing trunk a plurality of the digits registered, translating means effective to translate a predetermined number of digits each of any valueI as soon as registered in said register-sender, markers each including individual translating means for controlling the operation of said switching means to connect a calling incoming trunk to an idle outgoing trunk, and means controlled by said nist-mentioned translating means for immediately eiecting the association of a marker with said register-sender, the transmission of the same digits to said marker as were transmitted to said rst-mentioned translating means, and for effecting, the transmission over the outgoing trunk selected by said marker of all of the digits registered in said register-sender.

9. In a toll oce of a switching system comprising a plurality of toll and local oices, incoming trunks, outgoing trunks, switching means for connecting incoming trunks with outgoing trunks,

lili alregister-senden connected-.to a calling: incoming trunk,` said: register-sender comprising registersfor registering a plurality of digitsand comprising mea-ns for transmitting over a selected` outgoing trunk a pluralityfof the digits registered, translating;` means effective to translate a predeterminedv number of digits-r each of any value as sooniasregistered-in said register-sender., markers fon controlling the operation of said switching means-to.connect-a calling incoming trunk-to an' idleoutgoing ,trunk,.each of said markers includingi a. plurality of different translators, means in saidpregister-sender controlled by'said rst-mentioned translating means-for effecting the associationlof an idle one ofsaid markers with'said register-sender and for effecting the selection of adesired one of said translators in the associated markerand for effecting the transmission over the.` outgoing trunk selected by said marker of alleof. the digits registered in said .register-sender.

10. In atollofce of a switching system coinprisinga-:pluralityof toll and local offices, incoming trunks, groups of` outgoing trunks, switching means for connecting incoming-trunks with oui'- going trunks, aregister-sender connected to a calling-incoming trunk, said register-sender comprising registers for registering a plurality oi digits; pretranslators, means veffective to connect anidle. pretranslatorr to. saidy register-sender as soonas a/predetermined-number of digitshave been,registerecl in saidregister-sender, registers insaid pretranslator set inaccordance with the setting ,or said .predetermined .number of registers o` the register-sender, route relays in said pretranslator. and means for operating a route relay corresponding.tofthe.setting of the re A'sters of said, pretranslaton. class relays inv said. registersender., .means includingltne operated route relay in said pretranslator for effecting the operation ofgone or` more orsaidclass relays, toilcompleting markers.intertoll .markers, each.4 of said markers comprisingmeans including translating means for eieotingga connection between a callingincoming trunkandan idle outgoing trunk in a desired groupnitrunks, meanscontrolled -by an operated oneof-.said class relays .for connecting .the registersender to an idle..tolll. completing marker if. the callistobeextended oyer a trunk in a group out-- going to.a.-,local. oflice, and means controlled by an .operatedoneof saidy classyrelays for connectingthe .register-sender. to an idle intertollmarker ifltle call is to be extended.. over aI ltrunk in a groupfoutgoing to another. toll oice.

11'1. toll officev ofa switching system comprisingA aplurality ortoll .and local offices, incomingltrunks,T groups vof..; utgoing trunks,l switching means .for` connecting incoming trunks withoutgoing trunks, a register-sender' connected to a callingincoming trunk, said register-sender comprising. registers.. for. registering a plurality of digits, pretranslators, means effective to connect an idle. pretranslator to said register-sender as soon as a. predetermined number of digits have been. registered in said' register-sender, registers insaidpretranslator set in accordance. with the settingof said .predetermined number of registers otthe. register-sender, route relays in said pretranslator and means for operating aroute relay correspondingy to the settingy of the registers of said pretranslator, class relays -in said' registersender., means. including theioperated route relay in saidpretranslator for eiecting the operation of oneor. moreofsaid class relays, toll completing markers, ,intertoll markers, each of said markers comprisingmeans for effecting a connection beinsaid'register-sender, pretranslators, means eftween-a calling incoming trunkand an idle outgoing trunk` in a desired groupot trunks, each of said intertoll markers comprising a plurality of different translators, means controlled by an operatedY one of said class relays for connecting the register-sender to-an idle toll completing marker if the call is to be extended over a trunk in a group outgoing to a local oice, and means controlled by an operated one of said class relays for connecting the register-sender to any idle intertollmarker if the call is to be extended over a trunk ina group outgoing toanotlier toll office and for effecting the selection of the particular one of`said plurality of translators which is capable of effecting the selection of an idle trunk in a particular group of trunks.

12. In a toll oflice of a switching systemcomprising a plurality of toll and local oflices, incoming trunks, groups of outgoing trunks, switching means fory connectingincoming trunks with outgoing trunks, a register-sender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digitsland means for transmitting over a selectedl outgoing 4trunk a plurality of the digits registered fective to connect an idle pretranslatorY so said register-sender as soon as a predetermined number of digits have' been registered in said register-sender, registers in said-pretranslator set in accordance with the setting ofsaid predetermined number of registers of the register-sender, route relays in said pretranslator and means for operating'aroute relay corresponding to the setting ofthe registers of said pretranslator, class relays in saidV register-sender, means including the operated route relay'in said-pretransl-ator for effecting the operation of one or more of said class relays, t'oll completing markers, intertoll markers, each ofsaid markers comprising means including translating means for effecting a connection between a calling incoming trunk and an idle outgoing trunk in a desired group of trunks, means controlled by anoperated one of said class relays for connecting the register-sender to an idle toll completing marker if the call is to be extended overa-trunk in a group outgoing to a local office, andmeanscontrolled by an operated one of said class relays for connecting the register-sender to an idle intertoll'marker if the call is to be extended over a. trunk in a group outgoing to another toll oflice and for eiecting the transmission over the selected outgoing trunk of all of the digitsre'gisteredin said register-sender following said-:predetermined number of digits in case the selected outgoing trunk is in'agroup leading directly to the terminating toll oice through which the call isfrouted.

13.. In a-toll'oice of a switching system comprising a plurality of tolland local ofces, incoming trunks, groupsl of outgoing trunks, switching., means for connecting. incoming trunks with outgoing trunks, a register-sender connected to a callingfincoming-trunk, said register-sender comprising registersfor registering a plurality of digits and means for transmitting over a selected outgoing trunk a plurality of the digits registered insaid register-sender, pretranslators, means effective to connect an idle pretranslator to said register-sender as soon as a predetermined number` of digitshave been registered in said registersender, registers in said pretr-anslator set in accordance with the setting offsaid predetermined number of registers of the register-sender, routerelays.- in said pretranslator and means for operating a route relay corresponding to the setting of the registers of said pretranslator, class relays in said register-sender, means including the operated route relay in said pretranslator for effecting the operation of one or more of said class relays, toll completing markers, intertoll markers, each of said markers comprising means including translating means for effecting a connection between a calling incoming trunk and an idle outgoing trunk in a desired group of trunks, means controlled by an operated one of said class relays for connecting the register-sender to an idle toll completing marker if the call is to be extended over a trunk in a group outgoing to a local oflice, means controlled by an operated one of said class relays for connecting the registersender to an idle intertoll marker if the call is to be extended over a trunk in a group outgoing to another toll office and for effecting the transmission over the selected outgoing trunk of all of the digits registered in said register-sender in case the selected outgoing trunk is in a group leading to an intermediate toll odce through which the call is routed to a terminating toll olce.

14. In a toll oiilce of a switching system comprising a plurality of toll and local oiiices, incorning trunks, groups of outgoing trunks, switching means for connecting incoming trunks with outgoing trunks, a register-sender connected to a calling incoming trunk, said register-sender comprising registers for registering a plurality of digits and means for transmitting over a selected outgoing trunk a plurality of the digits registered in said register-sender, pretranslators, means effective to connect an idle pretranslator to said register-sender as soon as a predetermined number of digits have been registered in said register-sender, registers in said pretranslator set in accordance with the setting of said predetermined number of registers of the register-sender, route relays in said pretranslator and means for operating a route relay corresponding to the setting of the registers of said pretranslator, class relays in said register-sender, means including the operated route relay in said pretranslator for effecting the operation of one or more of said class relays, toll completing markers, intertoll markers, each of said markers comprising means for eifecting a connection between a calling incoming trunk and an idle outgoing trunk in a desired group of trunks, each of said intertoll markers comprising a plurality of different translators, means controlled by an operated one of saidvclass relays for immediately connecting the registersender to an idle toll completing marker if the call is to be extended over a trunk in a group outgoing to a local oiice and for eiecting the setting of the registers of the toll completing marker in accordance with the setting of the same registers of the register-sender as controlled the setting of the registers of the pretranslator, means controlled by an operated one of said class relays for immediately connecting the register-sender to an idle intertoll marker if the call is to be extended over a trunk in a group outgoing to another toll oice and the same digits are to be translated by the marker as were translated by the pretranslator, means controlled by an operated one of said class relays for connecting the register-sender to an intertoll marker after an additional predetermined number of digits have been registered in said register-sender and said additional digits are to be translated by the marker to determine the group of trunks in which an idle outgoing trunk is to be selected, means controlled by an operated one of said class relays for selecting a particular translator in the connected intertoll marker, and means controlled by a class relay for selectively effecting the transmission over a selected trunk of all of the digits registered in said registersender following said predetermined number of digits or the transmission over a selected trunk of all the digits registered in said register-sender'.

MARTIN E. MALONEY, FRANK F. SHIPLEY.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS

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